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The study was approved by Research Council (Grant No. 22892) and Research Ethics Committee of Bushehr University of Medical Sciences. The aims of the study were explained to all the participants of the study, and they were told that their name and identity will remain confidential and only a short part of their sayings will be cited in the report, and they can leave the study whenever they want without any adverse outcome. They were assured of confidentiality of records and transcriptions. All the participants gave their informed oral and written consent for participating in the study.

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Not applicable.

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The authors declare that they have no competing interests.

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